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suplike-social-website
a full self-hosted social network, easy to setup, backend API, Moderation, Admin dashboard, Developer console, bots, plugins and more.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
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KLiK-SocialMediaWebsite
Complete PHP-based Login/Registration system, Profile system, Chat room, Forum system and Blog/Polls/Event Management System.
I downloaded the docs from php.net
I cloned projects like Kirk social website on GitHub, tested it and looked trough the code to see how they did it.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.